January 18, 1908, is the anniversary of the death of Dutch ophthalmologist Herman Snellen, who created the familiar test for visual acuity And now a page from our "Sunday Morning" Almanac, January ...

Results from smartphone-based Snellen charts, which are eye charts used to measure visual acuity, are not consistent with results from standard Snellen visual acuity chart tests, according to a study ...

So the best recorded Snellen visual acuity of 20/8.9 is limited by the optical aberrations of the eye and is about 2.25 times better than the 20/20 we consider normal (Figure 1).

A novel, at-home test was accurate and reliable in measuring near visual acuity and may be a helpful self-monitoring tool for patients with chronic ocular conditions or limited access to ...

The actual number assigned to measure your acuity is based on how well you compare to a person known to have normal visual acuity. If you are tested at a distance of 20 feet and can read the same ...

Eye charts are designed to test visual acuity, or clarity of vision. Each chart design has limitations and advantages, depending on the clinical setting, patient profile, and diagnostic objective ...

Results from smartphone-based Snellen charts, which are eye charts used to measure visual acuity, are not consistent with results from standard Snellen visual acuity chart tests, according to a study ...

That’s the idea behind [Joel, Margot, and Yuchen]’s final project for [Bruce Land]’s ECE 4760— simulating the standard Snellen eye chart that tests visual acuity from an actual or ...

The top number in Snellen visual acuity is 20, which is the distance from the eye test is done. During the testing the line of the smallest letters that can be read is recorded.

This led to a drastic reduction in visual acuity; the observers, who normally had 20/20 vision, were on average now only able to read to approximately line six of the Snellen eye chart, to the ...

A possible explanation for the discrepancy between Snellen visual acuity and the calculated theoretical level of acuity required may be related to the fact that subjects reading a number-plate ...